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Finding the Fourth Proportional to 722,205.92, 996,643.95 and 399,915.93

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Solution

The fourth proportional to 722,205.92, 996,643.95 and 399,915.93 is: 551,883.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,205.92 : 996,643.95 = 399,915.93 : x
  2. Step 2: Convert to fraction form
    722,205.92/996,643.95 = 399,915.93/x
  3. Step 3: Cross multiply
    722,205.92x = 996,643.95 × 399,915.93
  4. Step 4: Simplify right side
    722,205.92x = 398,573,794,380.85
  5. Step 5: Solve for x
    x = 398,573,794,380.85/722,205.92
  6. Step 6: Final answer
    x = 551,883.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.